Azeotrope-like mixtures comprising heptafluorocyclopentane

Abstract

Disclosed is an azeotrope-like composition comprising: from about 2% by weight to about 50% by weight of a hydrofluorocarbon selected from the group consisting of 1,1,1,2,2,3,4,5,5,5-decafluoropentane and 1,1,1,3,3-pentafluorobutane, from about 2% by weight to about 50% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and an amount effective in dissolving oils and contaminants of trans-1,2-dichloroethylene. In another embodiment, are fluorocarbon solvent composition comprising from about 15 to about 99 weight percent 1,1,1,2,2,3,4,5,5,5-decafluoropentane and from about 85 to about 1 percent by weight 1,1,2,2,3,3,4-heptafluorocyclopentane wherein the freezing point of the composition is less than 0° C.

1. An azeotrope-like composition comprising from about from about 2% by weight to about 44% by weight 1,1,1,2,2,3,4,5,5,5-decafluoropentane, from about 2% by weight to about 50% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and at least about 47% by weight trans-1,2-dichloroethylene. 
     
     
       2. The azeotrope-like composition of  claim 1  wherein the composition comprises from about from about 2% by weight to about 35% by weight 1,1,1,2,2,3,4,5,5,5-decafluoropentane, from about 2% by weight to about 30% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and from about 54% by weight to about 90% by weight trans-1,2-dichloroethylene. 
     
     
       3. The azeotrope-like composition of  claim 1  wherein the composition comprises from about 5% by weight to about 20% by weight 1,1,1,2,2,3,4,5,5,5-decafluoropentane, from about 5% by weight to about 20% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and from about 60% by weight to about 88% by weight trans-1,2-dichloroethylene. 
     
     
       4. An azeotrope-like composition comprising from about from about 10% by weight to about 50% by weight 1,1,1,3,3-pentafluorobutane, from about 2% by weight to about 50% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and at least about 41% by weight trans-1,2-dichloroethylene. 
     
     
       5. The azeotrope-like composition of  claim 4  wherein the composition comprises from about from about 10% by weight to about 50% by weight 1,1,1,3,3-pentafluorobutane, from about 2% by weight to about 20% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, and from about 46% by weight to about 80% by weight trans-1,2-dichloroethylene. 
     
     
       6. The azeotrope-like composition of  claim 1  further comprising from about 1% by weight to about 6% by weight of an alcohol. 
     
     
       7. The azeotrope-like composition of  claim 6  wherein the alcohol is selected from the group consisting of methanol, ethanol, 1-propanol, 2-propanol and 2-methyl-2-propanol. 
     
     
       8. The azeotrope-like composition of  claim 7  wherein the alcohol is 2-propanol. 
     
     
       9. The azeotrope-like composition of  claim 6  wherein the composition comprises from about 2% by weight to about 25% by weight 1,1,1,2,2,3,4,5,5,5-decafluoropentane, from about 2% by weight to about 20% by weight 1,1,2,2,3,3,4-heptafluorocyclopentane, from about 60% by weight to about 90% by weight trans-1,2-dichloroethylene, and from about 2% by weight to about 5% by weight of an alcohol.